10123P010202030101的知识精选

若随机变量X的分布列为X-2-10123P0.10.20.20.30.10.1则当P(X<a)=0.8时...
问题详情:若随机变量X的分布列为X-2-10123P0.10.20.20.30.10.1则当P(X<a)=0.8时,实数a的取值范围是()A.(-∞,2]                      B.[1,2]C.(1,2]                        ...
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